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Processes 2019, 7(3), 173; https://doi.org/10.3390/pr7030173

Enhancement Effect of Ordered Hierarchical Pore Configuration on SO2 Adsorption and Desorption Process

1
School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, China
2
School of Science and Technology, Tianjin University, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Received: 28 February 2019 / Revised: 18 March 2019 / Accepted: 19 March 2019 / Published: 25 March 2019
(This article belongs to the Special Issue Energy, Economic and Environment for Industrial Production Processes)
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Abstract

Carbonaceous adsorbents with both high sulfur capacity and easy regeneration are required for flue gas desulfurization. A hierarchical structure is desirable for SO2 removal, since the micropores are beneficial for SO2 adsorption, while the mesopore networks facilitate gas diffusion and end-product H2SO4 storage. Herein, an ordered hierarchical porous carbon was synthesized via a soft-template method and subsequent activation, used in SO2 removal, and compared with coal-based activated carbon, which also had a hierarchical pore configuration. The more detailed, abundant micropores created in CO2 activation, especially the ultramicropores (d < 0.7 nm), are essential in enhancing the SO2 adsorption and the reserves rather than the pore patterns. While O2 and H2O participate in the reaction, the hierarchical porous carbon with ordered mesopores greatly improves SO2 removal dynamics and sulfur capacity, as this interconnecting pore pattern facilitates H2SO4 transport from micropores to mesopores, releasing the SO2 adsorption space. Additionally, the water-washing regeneration performances of the two types of adsorbents were comparatively determined and provide a new insight into the mass-transfer resistance in the pore structure. The ordered hierarchical carbon promoted H2SO4 desorption efficiency and cycled SO2 adsorption–desorption performance, further indicating that interconnecting micro- and mesopores facilitated the diffusion of adsorbates. View Full-Text
Keywords: hierarchical pore structure; ordered mesopores; SO2; adsorption; regeneration hierarchical pore structure; ordered mesopores; SO2; adsorption; regeneration
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Zhu, Y.; Miao, Y.; Li, H. Enhancement Effect of Ordered Hierarchical Pore Configuration on SO2 Adsorption and Desorption Process. Processes 2019, 7, 173.

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